Power control

ABSTRACT

The invention relates to control of transmission power in cellular networks, specifically in cells having transmitters in several frequency bands. The invention allows the network to control the maximum transmission power of a mobile station in more than one frequency band.

FIELD OF INVENTION

The invention relates to control of transmission power in communicationsnetworks, specifically in systems wherein transmitters operate inseveral frequency bands.

TECHNOLOGICAL BACKGROUND

A communications network is a facility which enables communicationbetween two or more entities such as user terminal equipment (mobile orfixed) or other communication device, network entities and other nodes.The communication may comprise, for example, communication of voice,electronic mail (email), text messages, data, multimedia and so on.

A communications network typically operates in accordance with a givenrules which set out what the various elements of a system are permittedto do and how that should be achieved. For example, a standard orspecification may define if the user, or more precisely user equipment,is provided with a circuit switched (CS) bearer or a packet switched(PS) bearer, or both. Communication protocols and/or parameters whichshould be used for the connection are also typically defined. Forexample, the manner in which communication should be implemented betweenthe user equipment and the elements of the communication networks istypically based on a predefined communication protocol.

Access to the communication network may be provided by a fixed line orwireless communication interface. Communication systems providingwireless access enable at least some degree of mobility for the usersthereof. More advanced mobility support can typically be added as anenhanced feature. An example of communication networks providingwireless access is a public land mobile network (PLMN). The public landmobile networks (PLMN) are commonly based on cellular technology. Incellular systems, a base transceiver station (BTS) or similar accessentity services mobile communication device or user equipment (UE) via awireless interface between these entities. These devices will in thefollowing be referred commonly as mobile stations. The communication onthe wireless interface between the mobile station and elements of thecommunication network can be based on an appropriate communicationprotocol. The operation of the base station apparatus and otherapparatus required for the communication can be controlled by one orseveral control entities. Non-limiting examples of PLMN systems includethe GSM (Global System for Mobile communications), the so called 2.5generation GPRS (General Packet Radio Service) or the third generation(3G) networks such as WCDMA (Wideband Code Division Multiple Access) orEDGE (Enhanced Data for GSM Evolution). Other examples of wirelessaccess technologies include various wireless local area networks (WLANs)and satellite based systems.

The various control entities of a communication system may beinterconnected. One or more gateway nodes may be provided for connectinga network to other communication networks, for example to an IP(Internet Protocol) and/or other packet switched data networks. In sucharrangements, the communications network provides user with access toexternal networks, hosts, or services offered by specific serviceproviders.

An example of the drawbacks of the current system will now be describedwith reference to the GSM (Global System for Mobile communication). Thefirst GSM networks were designed for voice services. When the use of theGSM data services started, it became evident that the circuit switchedbearer services were not particularly well suited for certain types ofapplications with a bursty nature. Therefore the new packet switched(PS) data transmission service GPRS (General Packet Radio Service) wasalso defined for packet services. GPRS is a packet radio networkutilising the GSM network, which endeavours to optimise data packettransmission by means of GPRS protocol layers on the air interfacebetween a mobile station and a GPRS network.

According to third generation partnership project (3GPP) standards, aGPRS mobile station (MS) can operate in one of three modes of operationas disclosed for example by the standard document 3GPP TS 23.060 version6.5.0 of June 2004. These modes are:

1. Class A mode of operation: the MS is attached to the both GPRS andother GSM services. The mobile user can make and/or receive calls on thetwo services simultaneously e.g. having a normal GSM voice call andreceiving GPRS data packets at the same time.

2. Class B mode of operation: the MS is attached to the both GPRS andother GSM services, but the MS can only operate on set of services at atime.

3. Class C mode of operation: the MS can only be attached either to theGSM network or the GPRS network. The selection is done manually andthere are no simultaneous operations.

Multiple frequency bands have been specified for example in the standard3GPP TS 45.005 version 6.6.0 of July 2004 for GSM operation. Amulti-band GSM network may use frequencies from multiple, typically two,different frequency bands. A single cell of a GSM system may usefrequencies from a single frequency band only or it may use frequenciesfrom multiple frequency bands. The latter is often called “common BCCHcell” as the frequency identifying the cell and broadcasting BCCH(broadcast control channel) information is common for traffic channelson that cell, where the traffic channels may be assigned on differentfrequency bands.

According to the 3GPP standards, a mobile station (MS) transmittingpacket data to the network uses the output power given by the formula inthe sub-clause 10.2.1 of the standard specification 3GPP TS 45.008version 6.0.8 of July 2004. According to that sub-clause the radiofrequency (RF) output power, P_(CH), to be employed by the mobilestation on each individual uplink Packet Data Channel (PDCH) shall be:P _(CH)=min(Γ₀−Γ_(CH)−α*(C+48), PMAX),

-   -   where    -   Γ_(CH) is an MS and channel specific power control parameter,        sent to the MS in an radio link control (RLC) control message        (see 3GPP TS 44.060). $\begin{matrix}        {{\Gamma_{0} = {39\quad{dB}\quad m\quad{for}\quad{GSM}\quad 400}},{{GSM}\quad 700},{{GSM}\quad 850\quad{and}\quad{GSM}\quad 900}} \\        {= {36\quad{dB}\quad m\quad{for}\quad{DCS}\quad 1800\quad{and}\quad{PCS}\quad 1900}}        \end{matrix}$    -   α is a system parameter, broadcast on PBCCH or optionally sent        to MS in an RLC control message (see 3GPP TS 44.018 and 3GPP TS        44.060).    -   C is the normalised received signal level at the MS as defined        in sub-clause 10.2.3.1 of the above referred standard        specification 3GPP TS 45.008.    -   PMAX is the maximum allowed output power in the cell,        -   which is        -   GPRS_MS_TXPWR_MAX_CCH if present,    -   MS_TXPWR_MAX_CCH otherwise.

As can be seen the key factor is the PMAX, since nevertheless what thecalculation gives the mobile station shall use the lowest of the two;(γ₀−Γ_(CH)−α*(C+48) or PMAX given as the network delivered parameter.PMAX parameter is broadcast on a broadcast control channel (BCCH) insystem information 13 (SI3) and in system information 14 (SI4) andrespectively on packet broadcast control channel (PBCCH) in packetsystem information 13 (PSI3), see, for example, 3GPP TS 44.018 version6.8.0 of July 2004 and 3GPP TS 44.060 version 6.8.0 of July 2004. Theformula and the comparison work well when the packet resources areallocated in the same band than BCCH and/or PBCCH.

The exemplifying Table 1 of FIG. 1 presents the nominal output powers ofGSM 400, GSM 900, GSM 850 and GSM 700 bands according to GSM standards.If the MS is packet idle mode listening BCCH (in 900 MHz band)intermittently and it receives the MS_TXPWR_MAX_CCH parameter with value8 then the nominal output power level is 27 dBm. Then the MS requestspacket resources and the network allocates resources on 1800 MHz. As canbe seen from the second table in the following, value 8 denotes 14 dBmon the 1800 MHz band instead of 27 dBm on 900 MHz band. Too low outputpower level may lead to a poor signal quality and respectively too highpower level may cause unnecessary interference.

Table 2 of FIG. 2 presents nominal output powers for DCS 1800 band asspecified in 3GPP TS 45.005 version 6.6.0 of July 2004.

These arrangements have certain problems. The mobile station's maximumoutput power is based on parameters received in system informationmessages on (P)BCCH channel while in the packet idle mode. When thenetwork allocates packet resources on a different frequency band thanthe common (P)BCCH channels the network may have difficulties in settingthe correct maximum output power for the mobile station. The networkcannot optimise the maximum power for each frequency band separately ina common BCCH cell and especially, because of the different mapping ofpower control levels on different frequency bands, the network cannotset the same dBm value, or a value that reflects the frequency bandspecific path loss for each frequency band on that cell, for the maximumoutput power on each frequency band.

SUMMARY OF THE INVENTION

Embodiments of the present invention aim to overcome one or several ofthe above problems.

According to one aspect of the invention there is provided a method forcontrolling transmission power of a mobile station communicating with atelecommunications network. The method comprises determining a maximumoutput power level of a mobile station in a first frequency band,transmitting a first parameter value indicative of said maximum outputpower level of a mobile station in a first frequency band, determining amaximum output power level of the mobile station in at least one secondfrequency band, and transmitting at least one second parameter valueindicative of the maximum output power level in association with said atleast one second frequency band.

According to another aspect of the invention, there is provided a methodfor determining maximum transmission power. The method comprisesreceiving in mobile station a first transmission power parameter value,determining an output power level of the mobile station in a firstfrequency band based on said first transmission power parameter value,receiving at least one second transmission power parameter value, anddetermining a maximum output power level of the mobile station in atleast one second frequency band based on said first transmission powerparameter value and at least one second transmission power parametervalue.

According to a yet another aspect of the invention, there is provided amethod for determining maximum transmission power. The method comprisesreceiving a first parameter value, determining a maximum output powerlevel of a mobile station in a first frequency band based on said firstparameter value, receiving a second parameter value, and determining amaximum output power level of the mobile station in a second frequencyband based on said second parameter value and a predetermined offsetvalue.

According to a yet another aspect of the invention, a method fordetermining maximum transmission power in a mobile station is provided.The method comprises receiving a power control parameter value,determining a maximum output power level of the mobile station in afirst frequency band based on said parameter value and a firstpredetermined offset value, and determining a maximum output power levelof the mobile station in a second frequency band based on said parametervalue and a second predetermined offset value.

According to a still another aspect of the invention, a method fordetermining maximum transmission power in a mobile station is provided.The method comprises receiving a power control parameter value,receiving a flag indicative how an output power is to be derived fromthe received power control parameter, detecting that the flag indicatesmulti-band operation, and determining a maximum output power level ofthe mobile station in a frequency band by mapping for a power controlparameter value and a predetermined frequency band specific offsetvalue.

There is also provided a node for a telecommunications networkconfigured to determine a maximum output power level of a mobile stationin a first frequency band, to transmit a first parameter valueindicating said maximum output power level of the mobile station, todetermine a maximum output power level of the mobile station in at leastone second frequency band, and to transmit at least one second parametervalue indicative the maximum output power level in association with saidat least one second frequency band.

According to an aspect, there is provided a mobile station configured toreceive a first maximum transmission power parameter value, to determinea maximum output power level of the mobile station in a first frequencyband based on said first parameter value, to receive a secondtransmission power parameter value, and to determine a maximum outputpower level of the mobile station in at least one second frequency bandbased on said first transmission power parameter value and at least onesecond transmission power parameter value.

According to another aspect, a mobile station is configured to receive afirst parameter value, to determine a maximum output power level of themobile station in a first frequency band based on said first parametervalue, to receive a second parameter value, and to determine a maximumoutput power level of the mobile station in a second frequency bandbased on said second parameter value and a predetermined offset value.

In accordance with a yet another aspect a mobile station is configuredto receive a power control parameter value, to determine a maximumoutput power level of the mobile station in a first frequency band basedon said power control parameter value and a first predetermined offsetvalue, and to determine a maximum output power level of the mobilestation in a second frequency band based on said power control parametervalue and a second predetermined offset value.

BRIEF DESCRIPTION OF THE DRAWINGS

Embodiments of the present invention will now be described by way ofexample with reference to the accompanying drawings, in which:

FIGS. 1 and 2 show nominal output power Tables for exemplifyingtelecommunications systems,

FIG. 3 illustrates a method according to an advantageous embodiment ofthe invention, and

FIG. 4 illustrates a method according to a further advantageousembodiment of the invention, and

FIG. 5 illustrates various further embodiments of the invention.

DETAILED DESCRIPTION OF EMBODIMENTS

FIG. 3 illustrates a method in accordance with an embodiment for anetwork node of a telecommunications network for controllingtransmission power of mobile stations communicating with thetelecommunications network. A maximum output power level of a mobilestation is first determined at 110 in a first frequency band, whereafter a first parameter value indicating said maximum output power levelof a mobile station is transmitted at 120 in a first frequency band. Amaximum output power level of a mobile station in a second frequencyband is also determined at 130, where after a second parameter valueindicating an offset from said maximum output power level of a mobilestation is transmitted in the first frequency band.

FIG. 4 illustrates a method in accordance with another embodiment fordetermining maximum transmission power in a mobile station of atelecommunications network. In the embodiment a first maximumtransmission power parameter value is received at 210, where after amaximum output power level of the mobile station in a first frequencyband is determined at 220 based on said first parameter value. A secondtransmission power parameter value can be received at 230, where after amaximum output power level of the mobile station in a second frequencyband can be determined at 240 based on said first and secondtransmission power parameter values.

FIG. 5 illustrates schematically a telecommunications system wherein thevarious embodiments may be implemented. FIG. 5 illustrates a mobilestation 300, a cellular network 340, and a network element 330 of thecellular network 340. In the example of FIG. 5, the network element 330is a base station.

A cellular network is typically arranged to serve a plurality of mobilestations, via a wireless interface between the mobile stations and basestations of the communication system. The cellular communication networkmay provide packet switched data transmission in the packet switcheddomain between a support node and a mobile station. The network in turnmay be connected to external networks, for example the Internet, via anappropriate gateway to allow communication between mobile stations andexternal networks. In addition to at least one gateway, a network maycomprise also other nodes, for example radio network and/or base stationcontrollers.

The base station 330 is arranged to transmit signals to and receivesignals from the mobile station 300, via respective wireless interfaces.Correspondingly, each mobile station is able to transmit signals to andreceive signals from the base stations via the wireless interface.

A mobile station within an access network may communicate via radionetwork channels which are typically referred to as radio bearers. Eachmobile station such may have one or more radio channels open at any onetime. The mobile station can be used for various tasks such as makingand receiving phone calls, for receiving and sending data from and to anetwork and for experiencing, for example, multimedia or other content.The mobile station is typically provided with a processor and memory foraccomplishing these tasks. The operation of the mobile station may becontrolled by means of a suitable user interface such as key pad, voicecommands, touch sensitive screen or pad, combinations thereof or thelike. A mobile station also typically comprise components such as anantenna, a transmitter, a power source,. Various components of a mobilestation known to a man skilled in the art, wherefore they are notdescribed in detail in this application. Non-limiting examples of themobile stations include a personal computer, a personal data assistant(PDA), a mobile phone, a portable computer, and various combinationsthereof.

FIG. 5 illustrates certain details of a mobile station 300 in accordancewith an embodiment. The mobile station 300 comprises a receiver 310 forreceiving a first maximum transmission power parameter value and asecond transmission power parameter value. The mobile station alsocomprises a controller 320 for determining a maximum output power levelof the mobile station in a first frequency band based on said firstparameter value, and for determining a maximum output power level of themobile station in a second frequency band based on said first and secondtransmission power parameter values. It is noted that these componentmay be provided separately for the first and second frequency bands, ifthis is deemed appropriate.

In an embodiment of the invention, the method can be implemented bymeans of software programs executed by a processor in the mobilestation. In such an implementation, the receivers 310 can be implementedusing computer software code means which are arranged to receive dataand store received parameter values, while said controllers 320 can beimplemented using computer software code means which perform saiddeterminations.

FIG. 5 also illustrates some further details of the network element 330,which comprises an implementation of an advantageous embodiment of theinvention. As shown in FIG. 5, the network element 330 comprises acontroller 332 for determining a maximum output power level of a mobilestation in a first frequency band, a transmitter 334 for transmitting afirst parameter value indicating said maximum output power level of amobile station in a first frequency band, a controller 332 determining amaximum output power level of a mobile station in a second frequencyband, and a transmitter 334 for transmitting a second parameter valueindicating an offset from said maximum output power level of a mobilestation in a first frequency band.

In a further advantageous embodiment of the invention, the invention canbe implemented using software in the network element. In thisembodiment, the controllers 332 can be implemented using computersoftware code means in the network element. Also the transmitters 334can be implemented as computer software code means causing thetransmission of said values from the processor unit of the networkelement.

According to an embodiment of the invention, existing parametersMS_TXPWR_MAX_CCH and GPRS_MS_TXPWR_MAX_CCH (if PBCCH is present) may beused to control maximum output power level of upper bands (e.g. DCS 1800MHz 1900 MHz) and a new parameter may used to control maximum outputpower level of lower bands (e.g. GSM 400, GSM 900, GSM 850 and GSM 700bands). This new parameter, here called the TBF_MS_TXPWR_MAX parameter,may be used to represent an offset from the upper band value.

According to a further embodiment of the invention, the TBF_MS_TXPWR_MAXparameter represents an absolute value.

The TBF_TXPWR_MAX parameter may be specified independently band by band.

The TBF_MS_TXPWR_MAX parameter can be transmitted in SI13 rest octetsinformation element (IE) sent on BCCH. In a PBCCH channel, the parametercan be transmitted in a PACKET SYSTEM INFORMATION 1 (PSI1) message.

According to an embodiment, existing parameters, for exampleMS_TXPWR_MAX_CCH and GPRS_MS_TXPWR_MAX_CCH (if PBCCH is present), may beused as a parameter to control maximum output power level of an upperfrequency band (e.g. 1800 MHz), and a first new parameter may be used tocontrol maximum output power level for one of the lower bands (e.g. 900MHz). Maximum output power levels for other bands may be specified usingfrequency band specific predetermined fixed offset parameters. Theseparameters may indicate the maximum transmission power for each band asan offset from said first new parameter. Alternatively, the offset maybe from the parameter associated with said upper frequency band, or fromanother further parameter. There can be a separate individually assignedpredetermined offset parameter for each of a plurality of frequencybands.

For example, in a GPRS system the above parameters could be such that a‘MS_TXPWR_MAX_CCH’ corresponds to the first parameter, and‘LB_MS_TXPWR_MAX_CCH’ corresponds to the second parameter.

For example, this mapping can be achieved by setting code point 1 forMS_TXPWR_MAX_CCH parameter (and respectively for GPRS_MS_TXPWR_MAX_CCHif PBCCH is present) and for a new parameter code point 10 (assumingthat existing mapping table specified in 3GPP TS 45.005 is used also fora new parameter). The corresponding mapping of the maximum output powermay then be: Frequency band offset 1800 MHz  28 dBm 900 MHz 23 dBm 450MHz 23 dBm − 6 dB = 17 dBm

Possible predetermined fixed offset values for different lower bandfrequencies may be set for example as follows (in the example relativeto the 900 MHz band): Frequency band offset 900 MHz 0 dB 850 MHz 0 dB700 MHz −2 dB 400 MHz −6 dB

Use of individually set offsets for different frequency bands has theadvantage that it can enable optimal maximum output power level settingfor all lower bands supported in a given cell.

According to a further embodiment, maximum output power on differentbands is controlled by predefining a frequency band specific offset foreach frequency band in use at a cell, transmitting a power controlparameter, and calculating the maximum output power value fortransmissions on a specific frequency band from said power controlparameter and the predefined offset value corresponding to this specificfrequency band.

The frequency band specific offset could be defined for all bands in useat a base station, e.g. as follows using 900 MHz band as a referenceband: Frequency band offset 1900 MHz  +6 dB 1800 MHz  +6 dB 900 MHz 0 dB850 MHz 0 dB 700 MHz −2 dB 400 MHz −6 dB

This embodiment can advantageously be implemented by arranging a basestation transmit a power control parameter according to prior art, and asecond power control parameter. In such an implementation, mobilestations which are incapable of performing the inventive method obey thepower control parameter transmitted according to prior art, and mobilestations which can perform according to the invention can use the secondpower control parameter and the predefined offset values for determiningmaximum transmission power levels in different frequency bands.

According to a still further embodiment of the invention, maximumtransmission powers in different frequency bands are controlled bystoring predetermined offset values in a mobile station and transmittingan indication from the network to the mobile station that these offsetvalues are to be applied. As a response to reception of said indication,it is possible to determine the maximum transmission power in afrequency band on the basis of a maximum transmission power parameterfor a predetermined frequency band (such as, for example, theMS_TXPWR_MAX_CCH or GPRS_MS_TXPWR_MAX_CCH parameter) and the offsetvalue corresponding to the frequency band. The transmission powerparameter may be defined as for specific predetermined frequency bands.A frequency band specific offset to this value may then be applied toother bands. This embodiment has advantage in that the indication thatthe offset values are to be applied can be as simple as a one-bit flagtransmitted from the base station to the mobile station. Because of thisthe implementation of this embodiment adds very little load on the airinterface.

The above described embodiments provide several advantages. Accuratecontrol of maximum output power on a common BCCH cell may be allowed.The behaviour of legacy terminals can be maintained as optimal aspossible. The link budget properties of different bands can be takeninto account without having a specific maximum output power parameterdefined for each band separately. The number of bits used for signallingcan be kept low.

It is noted that while the preceding description illustrates variousembodiments of the invention with reference to cellulartelecommunications systems such as the GSM and 3G systems, the inventionis not limited to cellular systems, but can be implemented in differenttypes of communication systems as well. The embodiments are applicableto packet switched access and circuit switched access.

It is also noted herein that while the above describes exemplifyingembodiments of the invention, there are several variations andmodifications which may be made to the disclosed solution withoutdeparting from the scope of the present invention as defined in theappended claims.

1. A method for controlling transmission power of a mobile stationcommunicating with a telecommunications network, comprising determininga maximum output power level of a mobile station in a first frequencyband, transmitting a first parameter value indicative of said maximumoutput power level of a mobile station in a first frequency band,determining a maximum output power level of the mobile station in atleast one second frequency band, and transmitting at least one secondparameter value indicative of the maximum output power level inassociation with said at least one second frequency band.
 2. A method asclaimed in claim 1, comprising transmitting at least one offset value.3. A method as claimed in claim 2, comprising transmitting a frequencyband specific offset value for the at least one second frequency band.4. A method as claimed in claim 1, wherein each second transmissionpower parameter value comprises an absolute value.
 5. A method fordetermining maximum transmission power, comprising receiving in mobilestation a first transmission power parameter value, determining anoutput power level of the mobile station in a first frequency band basedon said first transmission power parameter value, receiving at least onesecond transmission power parameter value, and determining a maximumoutput power level of the mobile station in at least one secondfrequency band based on said first transmission power parameter valueand at least one second transmission power parameter value.
 6. A methodas claimed in claim 5, wherein the step of determining a maximum outputpower level in the at least one second frequency band comprisesdetermining a maximum output power level based on said firsttransmission power parameter value and an offset value.
 7. A method asclaimed in claim 6, comprising receiving a frequency band specificoffset value for at least one second frequency band.
 8. A method asclaimed in claim 5, wherein the second transmission power parametervalue comprises an absolute value, and the step of determining a maximumoutput power level in the second frequency band comprises determiningthe maximum output power level based on said first transmission powerparameter value and said absolute value.
 9. A method as claimed in claim8, wherein each band is assigned with an absolute value.
 10. A methodfor determining maximum transmission power, comprising receiving a firstparameter value, determining a maximum output power level of a mobilestation in a first frequency band based on said first parameter value,receiving a second parameter value, and determining a maximum outputpower level of the mobile station in a second frequency band based onsaid second parameter value and a predetermined offset value.
 11. Amethod as claimed in claim 10, wherein the step of determining themaximum output power level in the second frequency band comprisesdetermining a maximum output power level based on at least one frequencyband specific predetermined offset value.
 12. A method as claimed inclaim 10, comprising receiving a parameter indicative of the maximumtransmission power for a frequency band as an offset from one secondparameter value.
 13. A method as claimed in claim 10, comprisingreceiving a parameter indicative of the maximum transmission power for afrequency band as an offset from said first parameter value.
 14. Amethod as claimed in claim 10, comprising determining the maximum poweroutput levels in a communications system employing General Packet RadioService.
 15. A method as claimed in claim 10, wherein the firstparameter value is associated with a upper band frequency and the secondparameter value is associated with a lower band frequency.
 16. A methodas claimed in claim 15, wherein the first parameter comprises aMS_TXPWR_MAX_CCH parameter and the second parameter comprises aLB_MS_TXPWR_MAX_CCH parameter.
 17. A method for determining maximumtransmission power in a mobile station, comprising receiving a powercontrol parameter value, determining a maximum output power level of themobile station in a first frequency band based on said parameter valueand a first predetermined offset value, and determining a maximum outputpower level of the mobile station in a second frequency band based onsaid parameter value and a second predetermined offset value.
 18. Amethod for determining maximum transmission power in a mobile station,comprising: receiving a power control parameter value, receiving a flagindicative how an output power is to be derived from the received powercontrol parameter, detecting that the flag indicates multi-bandoperation, and determining a maximum output power level of the mobilestation in a frequency band by mapping for a power control parametervalue and a predetermined frequency band specific offset value.
 19. Anode for a telecommunications network configured to determine a maximumoutput power level of a mobile station in a first frequency band, totransmit a first parameter value indicating said maximum output powerlevel of the mobile station, to determine a maximum output power levelof the mobile station in at least one second frequency band, and totransmit at least one second parameter value indicative the maximumoutput power level in association with said at least one secondfrequency band.
 20. A node as claimed in claim 19 being configured totransmit at least one offset value.
 21. A node as claimed in claim 20being configured to transmit a frequency band specific offset value forthe at least one second frequency band.
 22. A node as claimed in claim19, wherein each second transmission power parameter value comprises anabsolute value.
 23. A mobile station configured to receive a firstmaximum transmission power parameter value, to determine a maximumoutput power level of the mobile station in a first frequency band basedon said first parameter value, to receive a second transmission powerparameter value, and to determine a maximum output power level of themobile station in at least one second frequency band based on said firsttransmission power parameter value and at least one second transmissionpower parameter value.
 24. A mobile station as claimed in claim 23 beingconfigured to determine the maximum output power level of at least onesecond frequency band based on said first transmission power parametervalue and an offset value.
 25. A mobile station as claimed in claim 24,wherein the offset value comprises a frequency band specific offsetvalue.
 26. A mobile station as claimed in claim 23, wherein the secondtransmission power parameter value comprises an absolute value, themobile station being configured to determine a maximum output powerlevel in the second frequency based on said first transmission powerparameter value and said absolute value.
 27. A mobile station configuredto receive a first parameter value, to determine a maximum output powerlevel of the mobile station in a first frequency band based on saidfirst parameter value, to receive a second parameter value, and todetermine a maximum output power level of the mobile station in a secondfrequency band based on said second parameter value and a predeterminedoffset value.
 28. A mobile station as claimed in claim 27, the mobilestation being configured to determine the maximum output power level inthe second frequency band based on at least one frequency band specificoffset value.
 29. A mobile station as claimed in claim 27, wherein theoffset value is an offset from one second parameter value.
 30. A mobilestation as claimed in claim 27, wherein the offset value is an offsetfrom said first parameter value.
 31. A mobile station as claimed inclaim 27, the mobile station comprising a transmitter for communicationwith the telecommunications system based on General Packet RadioService.
 32. A mobile station as claimed in claim 27 being configured toprocess a first parameter value that is associated with a upper bandfrequency and a second parameter value that is associated with a lowerband frequency.
 33. A mobile station as claimed in claim 32, wherein thefirst parameter comprises a MS_TXPWR_MAX_CCH parameter and the secondparameter comprises a LB_MS_TXPWR_MAX_CCH parameter.
 34. A mobilestation configured to receive a power control parameter value, todetermine a maximum output power level of the mobile station in a firstfrequency band based on said power control parameter value and a firstpredetermined offset value, and to determine a maximum output powerlevel of the mobile station in a second frequency band based on saidpower control parameter value and a second predetermined offset value.35. A node for a telecommunications network comprising at least meansfor determining a maximum output power level of a mobile station in afirst frequency band, means for transmitting a first parameter valueindicating said maximum output power level of a mobile station in afirst frequency band, means for determining a maximum output power levelof a mobile station in a second frequency band, and means fortransmitting a second parameter value indicative of the maximum outputpower level in association with said second frequency band.
 36. A mobilestation comprising at least means for receiving a first maximumtransmission power parameter value, means for determining a maximumoutput power level of the mobile station in a first frequency band basedon said first parameter value, and means for determining a maximumoutput power level of the mobile station in another frequency band basedon a transmission power parameter value and a frequency band specificoffset value.
 37. A mobile station as claimed in claim 36, comprisingmeans for receiving a second transmission power parameter value, whereinthe means for determining the maximum output power level in the otherfrequency band are configured to determine the maximum power outputvalue based on said second transmission power parameter value and thefrequency band specific offset value.
 38. A mobile station comprising atleast means for receiving a first parameter value, means for determininga maximum output power level of the mobile station in a first frequencyband based on said first parameter value, means for receiving a secondparameter value, and means for determining a maximum output power levelof the mobile station in a second frequency band based on said secondparameter value and a predetermined offset value.
 39. A mobile station,comprising at least means for receiving a power control parameter value,means for determining a maximum output power level of the mobile stationin a first frequency band based on said power control parameter valueand a first predetermined offset value, and means for determining amaximum output power level of the mobile station in a second frequencyband based on said power control parameter value and a secondpredetermined offset value.
 40. A computer program embedded onto acomputer-readable medium comprising program code means configured toperform the steps of claim 1, when the program is run on a computer. 41.A computer program embedded onto a computer-readable medium comprisingprogram code means configured to perform the steps of claim 5, when theprogram is run on a computer.
 42. A computer program embedded onto acomputer-readable medium comprising program code means configured toperform the steps of claim 10, when the program is run on a computer.43. A computer program embedded onto a computer-readable mediumcomprising program code means configured to perform the steps of claim17, when the program is run on a computer.
 44. A computer programembedded onto a computer-readable medium comprising program code meansconfigured to perform the steps of claim 18, when the program is run ona computer.